Brake shoe



Ell. R. DE FRANCE.

BRAKE SHOE.

APPLICATION FILED lunaz 1918.

Pafelnrted May 6, 19M).

2 SHEETS-SHEET 1.

INVENTOH M. H. H FENCE. BRAKE SHE.

APPUCMIQN F\LEDsuNs2.2,1saa.

ma mwnw AW WB da;

Uivrrnn sTATns PAT MURRELL R. :GE FRANCE, 0F BELLEVUE, PENNSYLVAYIA.

familiar to those skilled in the art.. and gemerally consist of a number of iirictional materials such as iron borings and iinely di-l vided asbestos held together by means of a binder such as resins or resins and drying oils. It is believed that Vthe outer or frictional surface of these composition brake shoes have a much greater resistance to Wear than the inner portions thereof. itis my be lietl that the exposure of the outer surface .to the action of the air in some manner seasons or ages the composition thereby giving to 1t its Wear resisting qualities'.

f One object of this lnvention 1s to provide means whereby the entire mass of the frietional filler maybe uniformly aged or cured so as to be uniformly Wear resisting through` out.

A fur-ther object is to provide in a brake shoe having a composition frictional iller, longitudinal side Walls, which as they Wear doi/vn7 vwill presenta minimum amount of metal in contact with 'ii/heels against which they bear when applied.

A still further object is to provide in a filled brake shoe, a housing or easing having reticulated longitudinal side valls providing a maximum strength for a minimum weight.

These and other objects l attain by means of the brake shoe illustrated in the single sheet Yof drawings accompanying and forming a part of this application and throughout the several ,figures of which like elements are denoted by like characters.

ln the drawings Figure l is a view in side elevation of a brake shoe embodying this invention. Fig. 2is a longitudinal central see- 'tiou of the same, Fig. 3 is a cross sectional view of said shoe taken on the renter line thereto, Fig. 4i is a View in side elevation of a casing in which the side Walls are provided with diamond shaped holes punched Specification oiilletters atent.

Application ined June 22, wie.

patented May d, digiti.

Serial Ho. llilti.

' therein expanded ,in a manner similar to expanded metal as is now Well known, Fig. 5 is a top plan View of a modified' form of my invention and liig. 6 is a cross sectional view 'ot said form. A

ln carrying out one form of thisl invention l utilize a casing either made as a casting or pressed up from sheet metal and having a back il, longitudinal sides 5 and `ends 6. The casing at its center is provided with customary securing means '7.

The ends and back of the casing as illustrated in Figs. l, 2 and 3 are plain while the longitudinal sides are reticulated or in other'words provided `with a large number of holes or openings as shown at 8. lf the casing is cast these may be, formed in the casting or it the casing is pressed these may be punched or otherwiseiormed in the lone'i1 tudinal sides. The holes preferably cover about 1gof the side area.

The casing is lilled with suitable rictional material 9 having finely divided material and drying oils preferably as above set forth and pressed thereinto. After vthe iilling has been pressed into the casing so that it pro trudes through the perforations in the longitudinal sides. holes are -formed in the material extending inwardly from each longitudinal side and corresponding1 in 'number with the periorations and if this form is adopted these holes will preferably be arranged eoncentrically with the holes in the side walls, and, while they-may extend entirely through the filling material it is preferable to have them extend only about 2;-

of the Way across the shoe from side to side as shown 'in Fig. 3. lt it is found' desirable the holes on opposite sides or" the casing may be staggered but it is believed that it is preferable te have them in line as' shown in Fig.

Afterl 'the holes have been formed in the filler material, that portionfof the material which extends beyond the outer face of each side wall of the casing, that which has been )ressed out through the side wall o Jenin s is scraped oli' so as to leave the material Hush with the outer surfaces.

ln one embodiment of inv invention the brake Li is reticulated or perforated as shown in my eopending application Serial No. 211.277. `filed by me on January l0, 1918, and registering with these holes or perforations channels projecting into the filling material areformed as shown in said prior application. When the channels extend into the filling from front to back as shown in Fig. 6 the reticulated side Walls as shown in Figs. l r 4 are also utilized for the purpose of exposin the iilling material to the air and also or the purpose of offering minimum amount of nieta'l to the wheels as the brake shoes wear down.

It will be seen that from both of these constructions the filling material is provided with air holes so that air may come in contact with-the interior thereof and aid in .aging and seasonin or setting up the friction material' asvvel as Ventilating the same forfthe purpose of carrying away the heat or at leastL a rtion thereof generated duringthe applifatxon of the brake shoes.

Havingv thus described my invention what I claimv isb 1.- In a brake shoe, an lnclosmg metal ease having perforated longitudinal side walls y y and a filling of frictional material containing drying oils having channels extending thereinto' from opposite sides and register- Wall perforations.

-' .2. In a'brake shoe, an inclosing metal Voase having its longitudinal side Walls ,pro-

Vvided with closely arranged perfor-ations extending throughout the area of said Walls anda frictional filler containing material 31 adapted to be aged b exposure to the air' and having air channe s extending thereinto through said perforations.

3. In a brake shoe, an inelosing metal case the longitudinal side walls of which are perforated throughout their entire area with closely arranged holes and a filling of frietional material extending through said' holes and to the outer surface of said side walls containing binding material which ages upon exposure to the air and air channels of smaller bore than said holes and arranged to open into said perforations.

4. In a brake shoe1 an nelosing metal case having its longitudinal side walls perforated and a filling of frictional material Within said ease and containing binding material' adapted to beaged upon exposure to the air.

5. In a brake shoe, an inelosing metal case having its longitudinal side walls perfdrated and a filling of composite frietional materialv in said oase and extending through the side walls perforations to the outer plane of said side walls.

In testimony whereof, have hereunto @5 subscribed my naine this 14th day of June,

MURRELL R. DE FRANCE. 

